gcc/config/sh/linux.h

   1 /* Definitions for SH running Linux-based GNU systems using ELF
   2    Copyright (C) 1999-2015 Free Software Foundation, Inc.
   3    Contributed by Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* Run-time Target Specification.  */
  22
  23 /* Enable DWARF 2 exceptions.  */
  24 #undef DWARF2_UNWIND_INFO
  25 #define DWARF2_UNWIND_INFO 1
  26
  27 #undef SUBTARGET_CPP_SPEC
  28 #define SUBTARGET_CPP_SPEC "\
  29    %{posix:-D_POSIX_SOURCE} \
  30    %{pthread:-D_REENTRANT -D_PTHREADS} \
  31 "
  32
  33 #define TARGET_OS_CPP_BUILTINS() \
  34   do                                            \
  35     {                                           \
  36       GNU_USER_TARGET_OS_CPP_BUILTINS();        \
  37     }                                           \
  38   while (0)
  39
  40 #undef TARGET_DEFAULT
  41 #define TARGET_DEFAULT \
  42   (TARGET_CPU_DEFAULT | TARGET_ENDIAN_DEFAULT | TARGET_OPT_DEFAULT)
  43
  44 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
  45
  46 #if TARGET_ENDIAN_DEFAULT == MASK_LITTLE_ENDIAN
  47 #define MUSL_DYNAMIC_LINKER_E "%{mb:eb}"
  48 #else
  49 #define MUSL_DYNAMIC_LINKER_E "%{!ml:eb}"
  50 #endif
  51
  52 #if TARGET_CPU_DEFAULT & (MASK_HARD_SH2A_DOUBLE | MASK_SH4)
  53 /* "-nofpu" if any nofpu option is specified.  */
  54 #define MUSL_DYNAMIC_LINKER_FP \
  55   "%{m1|m2|m2a-nofpu|m3|m4-nofpu|m4-100-nofpu|m4-200-nofpu|m4-300-nofpu|" \
  56   "m4-340|m4-400|m4-500|m4al:-nofpu}"
  57 #else
  58 /* "-nofpu" if none of the hard fpu options are specified.  */
  59 #define MUSL_DYNAMIC_LINKER_FP "%{m2a|m4|m4-100|m4-200|m4-300|m4a:;:-nofpu}"
  60 #endif
  61
  62 #undef MUSL_DYNAMIC_LINKER
  63 #define MUSL_DYNAMIC_LINKER \
  64   "/lib/ld-musl-sh" MUSL_DYNAMIC_LINKER_E MUSL_DYNAMIC_LINKER_FP \
  65   "%{mfdpic:-fdpic}.so.1"
  66
  67 #define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
  68
  69 #undef SUBTARGET_LINK_EMUL_SUFFIX
  70 #define SUBTARGET_LINK_EMUL_SUFFIX "_linux"
  71 #undef SUBTARGET_LINK_SPEC
  72 #define SUBTARGET_LINK_SPEC \
  73   "%{shared:-shared} \
  74    %{!static: \
  75      %{rdynamic:-export-dynamic} \
  76      -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
  77    %{static:-static}"
  78
  79 /* Output assembler code to STREAM to call the profiler.  */
  80 #undef FUNCTION_PROFILER
  81 #define FUNCTION_PROFILER(STREAM,LABELNO)                               \
  82   do {                                                                  \
  83     if (TARGET_SHMEDIA)                                                 \
  84       {                                                                 \
  85         fprintf (STREAM, "\tpt\t1f,tr1\n");                             \
  86         fprintf (STREAM, "\taddi.l\tr15,-8,r15\n");                     \
  87         fprintf (STREAM, "\tst.l\tr15,0,r18\n");                        \
  88         if (flag_pic)                                                   \
  89           {                                                             \
  90             const char *gofs = "(datalabel _GLOBAL_OFFSET_TABLE_-(0f-.))"; \
  91             fprintf (STREAM, "\tmovi\t((%s>>16)&0xffff),r21\n", gofs);  \
  92             fprintf (STREAM, "\tshori\t(%s & 0xffff),r21\n", gofs);     \
  93             fprintf (STREAM, "0:\tptrel/u\tr21,tr0\n");                 \
  94             fprintf (STREAM, "\tmovi\t((mcount@GOTPLT)&0xffff),r22\n"); \
  95             fprintf (STREAM, "\tgettr\ttr0,r21\n");                     \
  96             fprintf (STREAM, "\tadd.l\tr21,r22,r21\n");                 \
  97             fprintf (STREAM, "\tld.l\tr21,0,r21\n");                    \
  98             fprintf (STREAM, "\tptabs\tr21,tr0\n");                     \
  99           }                                                             \
 100         else                                                            \
 101           fprintf (STREAM, "\tpt\tmcount,tr0\n");                       \
 102         fprintf (STREAM, "\tgettr\ttr1,r18\n");                         \
 103         fprintf (STREAM, "\tblink\ttr0,r63\n");                         \
 104         fprintf (STREAM, "1:\tld.l\tr15,0,r18\n");                      \
 105         fprintf (STREAM, "\taddi.l\tr15,8,r15\n");                      \
 106       }                                                                 \
 107     else                                                                \
 108       {                                                                 \
 109         if (flag_pic)                                                   \
 110           {                                                             \
 111             fprintf (STREAM, "\tmov.l\t3f,r1\n");                       \
 112             fprintf (STREAM, "\tmova\t3f,r0\n");                        \
 113             fprintf (STREAM, "\tadd\tr1,r0\n");                         \
 114             fprintf (STREAM, "\tmov.l\t1f,r1\n");                       \
 115             fprintf (STREAM, "\tmov.l\t@(r0,r1),r1\n");                 \
 116           }                                                             \
 117         else                                                            \
 118           fprintf (STREAM, "\tmov.l\t1f,r1\n");                         \
 119         fprintf (STREAM, "\tsts.l\tpr,@-r15\n");                        \
 120         fprintf (STREAM, "\tmova\t2f,r0\n");                            \
 121         fprintf (STREAM, "\tjmp\t@r1\n");                               \
 122         fprintf (STREAM, "\tlds\tr0,pr\n");                             \
 123         fprintf (STREAM, "\t.align\t2\n");                              \
 124         if (flag_pic)                                                   \
 125           {                                                             \
 126             fprintf (STREAM, "1:\t.long\tmcount@GOT\n");                \
 127             fprintf (STREAM, "3:\t.long\t_GLOBAL_OFFSET_TABLE_\n");     \
 128           }                                                             \
 129         else                                                            \
 130           fprintf (STREAM, "1:\t.long\tmcount\n");                      \
 131         fprintf (STREAM, "2:\tlds.l\t@r15+,pr\n");                      \
 132       }                                                                 \
 133   } while (0)
 134
 135 /* For SH3 and SH4, we use a slot of the unwind frame which correspond
 136    to a fake register number 16 as a placeholder for the return address
 137    in MD_FALLBACK_FRAME_STATE_FOR and its content will be read with
 138    _Unwind_GetGR which uses dwarf_reg_size_table to get the size of
 139    the register.  So the entry of dwarf_reg_size_table corresponding to
 140    this slot must be set.  To do this, we redefine DBX_REGISTER_NUMBER
 141    so as to return itself for 16.  */
 142 #undef DBX_REGISTER_NUMBER
 143 #define DBX_REGISTER_NUMBER(REGNO) \
 144   ((! TARGET_SH5 && (REGNO) == 16) ? 16 : SH_DBX_REGISTER_NUMBER (REGNO))
 145
 146 /* Since libgcc is compiled with -fpic for this target, we can't use
 147    __sdivsi3_1 as the division strategy for -O0 and -Os.  */
 148 #undef SH_DIV_STRATEGY_DEFAULT
 149 #define SH_DIV_STRATEGY_DEFAULT SH_DIV_CALL2
 150 #undef SH_DIV_STR_FOR_SIZE
 151 #define SH_DIV_STR_FOR_SIZE "call2"
 152
 153 /* Install the __sync libcalls.  */
 154 #undef TARGET_INIT_LIBFUNCS
 155 #define TARGET_INIT_LIBFUNCS  sh_init_sync_libfuncs
 156
 157 #undef SUBTARGET_OVERRIDE_OPTIONS
 158 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 159   do                                                                    \
 160     {                                                                   \
 161       /* Set default atomic model if it hasn't been specified.  */      \
 162       if (global_options_set.x_sh_atomic_model_str == 0)                \
 163         {                                                               \
 164           if (TARGET_SH3)                                               \
 165             sh_atomic_model_str = "soft-gusa";                          \
 166           else if (TARGET_SH1)                                          \
 167             sh_atomic_model_str = "soft-imask";                         \
 168         }                                                               \
 169       /* Set -musermode if it hasn't been specified.  */                \
 170       if (global_options_set.x_TARGET_USERMODE == 0)                    \
 171         TARGET_USERMODE = true;                                         \
 172     }                                                                   \
 173   while (0)